JPH08199612A - Sealing structure for setup mortar in cover receiving frame for underground structure - Google Patents

Abstract

PURPOSE: To easily seal setup mortar without using large jigs when a cover receiving frame is set up. CONSTITUTION: A cover receiving frame, annularly formed around an opening in a fire hydrant, has a main portion and a mounting portion 15 bulged from the main portion to the radial direction, each of which is formed in an annular shape, so that the mounting portion 15 may be faced to the upper face of the opening to fill setup mortar 11 between the lower face of the mounting portion 15 and the upper face of the opening. An inner periphery side bent edge 17 which is integrally formed on all periphery at the inner periphery edge of the mounting portion 15 and extended downward can be inserted into the opening. The outer periphery of the inner periphery side bent edge 17 is faced to the inner periphery of the opening to arrange the cover receiving frame and a seal member 23 made of flexible material is held on at least one of the outer periphery of the inner periphery side bent edge 17 and the inner periphery of the opening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing leakage of mortar for installation in a receiving frame for a lid of an underground structure such as a manhole.

[0002]

2. Description of the Related Art In underground structures such as manholes,
An annular receiving frame for the lid is installed so as to surround the opening, and a lid is installed on the receiving frame for the lid so that it can be opened and closed. The lid and the receiving frame for the lid constituting the opening of such an underground structure. Is
For convenience of transportation on the surface of the earth, it is generally installed in conformity with the surface of the earth.

[0003] When the lid receiving frame and the like are installed in accordance with the surface of the earth in this manner, the opening itself of the underground structure is usually in a state in which the lid receiving frame and the like installed therein are highly accurately aligned with the surface of the earth. Since it is difficult to form so, first, the lid receiving frame is positioned so as to have a required height above the opening, and the mounting portion of the lid receiving frame is exposed to the upper surface of the opening, The lid receiving frame is installed by filling the installation mortar between the lower surface of the mounting portion and the upper surface of the opening.

By the way, in such installation work, since the installation mortar is in the form of a slurry or liquid in order to improve the filling property, etc., it is necessary to fill the site to be filled until the installation mortar hardens to some extent. It is necessary to maintain.

Therefore, in the conventional work, the installation mortar is prevented from leaking by using a relatively large jig formed in a ring shape by an elastic band.

[0006]

In such a conventional method for preventing leakage of mortar for installation, it is necessary to bring a large jig to install the receiving frame for the lid, and the jig is attached to and detached from the opening. Work is troublesome because it requires force.

The present invention has been made under such circumstances, and it is an object of the present invention to facilitate the work of preventing the installation mortar from leaking without having to bring a large jig when installing the receiving frame for the lid. To do.

[0008]

In order to achieve this object, the invention according to claim 1 is a receiving frame for a lid which is annularly formed in plan view so as to surround an opening of an underground structure, The main part and the mounting part protruding from the main part in the radial direction are each formed in an annular shape, and the mounting part is placed between the lower surface of the mounting part and the upper surface of the opening so that the mounting part faces the upper surface of the opening part. In a case where the mortar is filled and installed, a hanging portion that is integrally formed over the entire circumference on the inner peripheral edge side of the mounting portion and extends downward can be inserted into the opening portion, and The lid receiving frame is arranged so that the outer peripheral side of the hanging portion faces the inner peripheral surface, and a seal member made of a flexible material is held on at least one of the outer peripheral surface of the hanging portion and the inner peripheral surface of the opening. The installation mole in the receiving frame for the lid of the underground structure, which is characterized by It is a leakage preventing structure of Le.

[0009]

According to the leak preventive structure of the installation mortar in the receiving frame for the lid of the underground structure according to claim 1, in the receiving frame for the lid of the underground structure of this type, the installation mortar extends over the entire circumference on the inner peripheral edge side of the mounting portion. A hanging part that is integrally formed and extends downwardly can be inserted into the opening, and the receiving frame for the lid is arranged so that the outer peripheral side of the hanging part faces the inner peripheral surface of the opening of the underground structure. In addition, since the sealing member made of a flexible material is held on at least one of the outer peripheral surface of the hanging portion and the inner peripheral surface of the opening, the lid receiving frame and the opening prevent the installation mortar from leaking. This eliminates the need for special jigs.

Therefore, it is not necessary to bring a large jig to the installation site of the receiving frame for the lid as in the prior art, and since such a jig is not used, the jig attaching / detaching work can be omitted. Mortal leak prevention work becomes easy.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. This embodiment relates to a round fire hydrant box as an underground structure.

First, the overall outline of the fire hydrant box will be described with reference to FIG.

The fire hydrant box 1 is formed as a vertical hole from the surface of the earth 2, and the fire hydrant box 1 is installed so that a fire hydrant (not shown) buried underground is located at the bottom of the fire hydrant box 1.

At the bottom of the fire hydrant box 1, a bottom plate 3 made of a ready-made plastic molded product is separately arranged on the left and right of a fire hydrant (not shown), and a lower unit 4 made of a ready-made concrete molded product is placed on the bottom plate 3. , The middle unit 5, and the upper unit 6 are sequentially stacked to form a fire hydrant box 1.
The skeleton 7 is formed.

Since the skeleton body 7 thus formed uses the ready-made units as described above, the bottom plate 3 is located at a position (depth) corresponding to the fire hydrant buried in the ground.
When installed on the ground surface, the upper end of the body 7 is always
It is not possible to make the state of high precision match with.

Further, due to the strength of the ground and the earth pressure, the structure 7
It is difficult to match the upper end of the skeleton 7 with the ground surface 2 with high accuracy even if the subduction amount of the

Therefore, the fire hydrant box 1 of this embodiment
In the opening 8 which is the upper end of the skeleton 7, a mortar layer is formed on the upper surface of the upper unit 6 with the mortar 11 for installation to adjust the level, and the receiving frame 12 for the lid is installed on the mortar layer. The lid receiving frame 12 and the lid 13 that can be opened and closed by the lid receiving frame 12 are in a state of being aligned with the ground surface 2.

In this embodiment, the lid receiving frame 12 is formed in an annular shape in plan view, and its cross-sectional shape is as follows.

That is, as shown in the enlarged view of FIG. 3, the lid receiving frame 12 has a main portion 14 extending vertically along the outer peripheral side of the lid receiving frame 12 and formed in an annular shape in plan view. Have.

At the lower part of the main portion 14, a mounting portion 15 which projects radially inward of the main portion 14 is integrally formed, and the mounting portion 15 also extends over the entire circumference of the lid receiving frame 12. Are continuously formed in a ring shape.

In this embodiment, bent edge portions 17 and 18 extending downward are integrally formed at the inner peripheral side edge and the outer peripheral side edge portion of the mounting portion 15, respectively. The rim 17 corresponds to the hanging part in the present invention.

The bent edges 17 and 18 are both formed in a ring shape over the entire circumference of the mounting portion 15, and the bent edge 17 on the inner peripheral side is located on the inner peripheral side of the upper portion of the upper unit 6 ( The diameter is formed so that it can be inserted into the opening 8), and the outer peripheral side bent edge 18 is formed in a size capable of accommodating the upper unit 6 therein.

Therefore, when the lid receiving frame 12 is installed on the upper portion of the upper unit 6, the upper portion of the upper unit 6 is provided between the mounting portion 15 and the bent edges 17 and 18 on the inner peripheral side and the outer peripheral side. It is mounted so that it can be inserted (see FIG. 3).

In the figure, reference numeral 16 designates a through hole, and in this embodiment, it is formed at a position where the mounting portion 15 over the entire circumference of the lid receiving frame 12 is divided into eight parts.

The main portion 1 above the mounting portion 15
4, an upper projecting portion 21 is integrally formed, and the upper projecting portion 21 is formed in an annular shape over the entire circumference like the main portion 14, and an inner peripheral side edge portion of the upper projecting portion 21. Is a lid receiving portion 2 formed by an upward-opening tapered surface.
2 is formed all around.

A seal member 23 made of a flexible material is attached to the lower end of the bent edge 17 on the inner peripheral side of the receiving frame 12 for a lid formed in this way over the entire circumference.

The seal member 23 is, for example, an extruded product obtained by extruding a chloroprene resin, a neoprene resin, or a urethane foam rubber in a substantially V-shaped cross section.

Then, in the seal member 23, an elastically deformable lip portion 23a is integrally formed at a portion mounted toward the inner peripheral surface side of the upper unit 6 (see FIG. 1). .

In this embodiment, the seal member 23 is
Although it is elastically held by its own elastic force by being fitted to the lower end portion of the inner peripheral side bent edge 17,
It may be held by using an adhesive or an adhesive.

The lip portion 23a is appropriately elastically deformed by coming into contact with the inner peripheral surface of the upper unit 6, and the outer peripheral surface of the inner peripheral side bent edge 17 and the upper unit 6 are allowed.
Liquid-tightly seal between the inner peripheral surface of and.

The seal member is not limited to the one shown in this embodiment, and various flexible materials such as plastic and rubber can be used, and the seal member has various shapes and structures. Can be used.

In this way, the lid receiving frame 12 with the seal member 23 mounted thereon is required by using the fixing bolts 25 for the nut members 24 installed at two diametrical locations on the inner peripheral side of the upper unit 6, respectively. Make them support the level.

In this state, the space formed between the upper surface of the upper unit 6, the mounting portion 15, and the inner and outer peripheral side bent edges 17, 18 is the lip portion of the seal member 23. 23a seals between the outer peripheral surface of the inner peripheral side bent edge portion 17 and the inner peripheral surface of the upper unit 6 as the skeleton 7, and the outer peripheral side of the skeleton 7 is filled with the earth and sand 26 back to make it almost liquid. Can be dense.

Then, the mortar 11 for installation in the space
Is injected from the through hole 16 and filled, and the lid receiving frame 12 is placed on the mortar layer thus formed.

In this embodiment, the installation mortar 11
Is a so-called grouting material,
The mortar material has good fluidity when uncured.

In the filling work of the installation mortar 11 thus performed, as described above, the sealing member 2 is used.
Since the inner peripheral side of the skeleton 7 is sealed by the lip portion 23a of 3, and the outer peripheral side of the skeleton 7 is almost liquid-tight by backfilling with the earth and sand 26, a large special jig like the conventional one is used. Even without using it, it is possible to prevent the installation mortar 11 from leaking.

Therefore, unlike the conventional case, it is not necessary to bring a large jig to the installation site of the lid receiving frame 12, and the jig attaching / detaching work can be omitted, which facilitates the work.

In the embodiment described above, the seal member 23 is installed only at the lower end of the inner peripheral side bent edge 17, but the seal member 23 is similarly installed at the lower end of the outer peripheral side bent edge 18. If the lip portion 23a is attached and the outer peripheral surface of the upper unit 6 is sealed, the installation mortar 11 can be prevented from leaking better.

Next, a second embodiment shown in FIG. 4 will be described.

In the second embodiment, an annular groove 41 is formed in the upper inner peripheral surface of the upper unit 6 forming the skeleton 7, and an O-ring shaped seal member 42 is held on the inner peripheral surface of the upper unit 6. This is different from the previous embodiment in that the outer peripheral side bent edge portion 18 is not formed.

In the second embodiment as described above, the upper unit 6 is provided by the seal member 42 as in the first embodiment.
The inner peripheral surface of the upper unit 6 and the outer peripheral surface of the inner peripheral side bent edge portion 17 are sealed, and the outer peripheral side of the upper unit 6 is almost liquid-tight by the backfilled earth and sand 26. It is possible to prevent the installation mortar 11 from leaking without using the jig.

Next, a third embodiment shown in FIG. 5 will be described.

In the third embodiment, an annular concave groove 45 is formed on the outer peripheral surface of the inner peripheral side bent edge portion 17, and an O-ring shaped seal member 42 is held in this groove.

Also in the third embodiment as described above, the upper unit 6 is provided by the seal member 42 as in the first embodiment.
The inner peripheral surface of the upper unit 6 is sealed by the seal member 42, and the outer peripheral side of the upper unit 6 is almost liquid-tight due to the earth and sand 26 that has been backfilled. It is possible to prevent the installation mortar 11 from leaking without using such a special jig.

In the embodiment described above, the seal member made of a flexible material is held on either the inner peripheral surface side of the body or the outer peripheral surface of the inner peripheral side bent edge portion. You may make it each hold | maintain a sealing member.

Although each of the above-mentioned embodiments relates to a fire hydrant box, the present invention is not limited to this, and is also applicable to a lid receiving frame used for opening sewer manholes and various underground structures similar thereto. It is needless to say that the shape of the lid receiving frame in plan view may be a square annular shape.

[0047]

As described above, according to the leak preventive structure for installation mortar in the receiving frame for the lid of the underground structure according to claim 1, in the receiving frame for the lid of this type of underground structure, The hanging part that is integrally formed over the entire circumference of the inner peripheral side and extends downwardly can be inserted into the opening, and the outer peripheral side of the hanging part is attached to the inner peripheral surface of the opening of the underground structure. The lid receiving frame is arranged so as to face, and the seal member made of a flexible material is held on at least one of the outer peripheral surface of the hanging portion and the inner peripheral surface of the opening. Leakage of installation mortar can be prevented, and no special jig is required.

Therefore, it is not necessary to bring a large jig to the installation site of the receiving frame for the lid as in the conventional case, and since such a jig is not used, the jig attaching / detaching work can be omitted. Mortal leak prevention work becomes easy.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part of a leak preventive structure for installation mortar in a receiving frame for a lid.

FIG. 2 is a schematic sectional view of a fire hydrant box.

FIG. 3 is a sectional view of a receiving frame for a lid.

FIG. 4 is a sectional view of a receiving frame for a lid according to a second embodiment.

FIG. 5 is a sectional view of a receiving frame for a lid according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire hydrant box (underground structure) 8 Opening 11 Mortar for installation 12 Receiving frame for lid 14 Main part 15 Mounting part 17 Inner circumference side bent edge (hanging part) 23 Seal member

Claims (1)

[Claims] 1. A receiving frame for a lid, which is formed in a ring shape in plan view so as to surround an opening of an underground structure, wherein a main part and a mounting part protruding from the main part in a radial direction are formed in a ring shape, respectively. The mounting portion is installed by facing the upper surface of the opening with filling mortar between the lower surface of the mounting portion and the upper surface of the opening. A hanging part that is integrally formed over and extends downwardly can be inserted into the opening, and the lid receiving frame is arranged so that the inner peripheral surface of the opening faces the outer peripheral side of the hanging part. At the same time, a seal member made of a flexible material is held on at least one of the outer peripheral surface of the hanging portion and the inner peripheral surface of the opening, and the mortar for installation is prevented from leaking in the receiving frame for the lid of the underground structure. Construction.